MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS:- 1.)What is the difference between alpha iron, delta iron and gamma iron ? Ans: The bcc form of iron exists between room temperature and 910°C, and between 1400°C and the melting point at 1539°C. The lower temperature form is known as alpha-iron and the higher temperature form as delta-iron. The face-centered cubic form existing between 910°C and 1400°C is referred to as gamma-iron. 2.)Explain the difference between the points of inflexion and contraflexure. Ans: At points of inflexion in a loaded beam the bending moment is zero and at points of contraflexure in loaded beam the bending moment changes sign from increasing to decreasing. 3.)What do you understand by eutectic ? Ans: It is mechanical mixture of two or more phases which solidify simultaneously from the liquid alloy. 4.)Under what condition a convergent divergent nozzle required ? Ans: When pressure ratio is greater than critical pressure ratio.
Posted on: Sun, 20 Oct 2013 08:49:09 +0000
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